Numbers are boring (sorry, accountants). So this reinterpretation of Sudoku by Brass Monkey uses colored wooden balls instead. Includes 81 balls and a gamebook with hundreds of setups to solve with friends (or by yourself if you're into that). Bonus: everything stores away into the box (that is also the game board), so it's perfect for traveling. • Features 81 painted ball pieces that nest into the holes of the included game board. • Perfect for traveling (or playing during mild earthquakes). • Includes a gamebook with hundreds of puzzles to set up and solve...alone or with friends. • Everything (including the game board) packs away into the display-worthy box. • Box measures 7.8" square (by 2.8" deep if you're curious).